ASRock B75M-GL R2.0 manual 31

1 2 3 4

Though this motherboard provides 4-Pin CPU fan (Quiet Fan) support, the 3-Pin CPU fan still can work successfully even without the fan speed control function. If you plan to connect the 3-Pin CPU fan to the CPU fan connector on this motherboard, please connect it to Pin 1-3.Pin 1-3 Connected

3-Pin Fan Installation

The front panel design may differ by chassis. A front panel module mainly consists of power switch, reset switch, power LED, hard drive activity LED, speaker and etc. When connecting your chassis front panel module to this header, make sure the wire assignments and the pin assign-ments are matched correctly.

Chassis Speaker Header	1				Please connect the chassis
					speaker to this header.
(4-pin SPEAKER 1)				SPEAKER
				DUMMY
(see p.2, No. 15)		+5V DUMMY
Chassis and Power Fan Connectors					Please connect the fan cables
(4-pin CHA_FAN1)		GND			to the fan connectors and match
(see p.2, No. 8)		+12V			the black wire to the ground pin.
		CHA_FAN_SPEED
		FAN_SPEED_CONTROL			CHA_FAN1 supports Fan
(3-pin PWR_FAN1)	PWR_FAN_SPEED				Control.
(see p.2, No. 1)				+12V
				GND
CPU Fan Connectors		FAN_SPEED_CONTROL			Please connect the CPU fan
(4-pin CPU_FAN1)		CPU_FAN_SPEED			cable to the connector and
			+12V
					match the black wire to the
(see p.2, No. 4)			GND

ground pin.

ATX Power Connector		12	24	Please connect an ATX power
(24-pin ATXPWR1)				supply to this connector.
(see p.2, No. 6)
		1	13
	Though this motherboard provides 24-pin ATX power connector,				12	24
	it can still work if you adopt a traditional 20-pin ATX power supply.
	To use the 20-pin ATX power supply, please plug your
	power supply along with Pin 1 and Pin 13.
				20-Pin ATX Power Supply Installation
					1	13

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ASRock B75M-GL R2.0 Motherboard